Why does my weight change but not my mass?

Mass is the amount of matter in your body and never changes. Weight is the force of gravity pulling on that mass, so it changes with each body's surface gravity.

Which body's gravity is used?

Each figure uses the body's surface gravity relative to Earth, for example Mars is about 0.377 g and Jupiter about 2.528 g.

How is weight on another planet calculated?

Multiply your Earth weight by that body's surface gravity relative to Earth. On the Moon (0.1657 g) a 70 kg person weighs 70 × 0.1657 ≈ 11.6 kg-force.

Where would I weigh the most?

Of the listed bodies, the Sun has by far the strongest surface gravity at about 27.9 times Earth's, so you would weigh nearly 28 times more there. Among planets, Jupiter is heaviest at about 2.53 g.

Where would I weigh the least?

The dwarf planet Ceres has the weakest gravity here at about 0.029 g, followed by Pluto at 0.063 g and the Moon at 0.166 g — you would weigh only a small fraction of your Earth weight.

Does Saturn really have gravity close to Earth's?

Yes. Despite being a giant planet, Saturn's low density gives it a surface gravity of about 1.065 g — only slightly more than Earth's — so your weight there would feel almost normal.

Is my weight sent anywhere?

No — every calculation runs locally in your browser and nothing is uploaded.

Planet Weight Calculator

How much would you weigh on another planet?

Your mass is fixed, but your weight depends on the local pull of gravity. Enter your Earth weight and this calculator shows what you would weigh across the solar system — Mercury, Venus, Mars, the Moon, Jupiter, Saturn, Uranus, Neptune, Pluto, Ceres and even the Sun — all at once. It is a fun, intuitive way to feel the difference in surface gravity between worlds.

How it works

The tool multiplies your Earth weight by each body’s surface gravity relative to Earth (where Earth = 1):

weight on body = Earth weight × gravity factor

Because it is a simple ratio, the unit you enter (kg or lb) is preserved in the results.

Example

A person weighing 70 kg on Earth:

Moon (0.1657 g): 70 × 0.1657 ≈ 11.6 kg
Mars (0.377 g): 70 × 0.377 ≈ 26.4 kg
Jupiter (2.528 g): 70 × 2.528 ≈ 177 kg

Body	Gravity (Earth = 1)	70 kg →
Moon	0.1657	11.6 kg
Mars	0.377	26.4 kg
Saturn	1.065	74.6 kg
Jupiter	2.528	177 kg
Sun	27.9	1953 kg

Everything runs in your browser. Nothing you type is uploaded.